Table 5.
Change in the ion/Ca2+ molar ratio (mean of days 15 and 30) of phloem sap and xylem sap exuded from excised roots and intact shoots of Nerium oleander plants due to 100 mm NaCl as affected by ammonium or nitrate as nitrogen source
| NH4+-N |
NO3−-N |
|||
|---|---|---|---|---|
| 0 | 100 | 0 | 100 | |
| Phloem sap | ||||
| Na+/Ca2+ | 1·55 | 3·15 | 1·61 | 2·05 |
| K+/Ca2+ | 72·99 | 77·34 | 110·05 | 101·37 |
| Cl−/Ca2+ | 66·99 | 96·47 | 49·47 | 74·77 |
| Xylem root | ||||
| Na+/Ca2+ | 0·90 | 9·79 | 1·17 | 6·17 |
| K+/Ca2+ | 8·83 | 6·75 | 7·57 | 6·36 |
| Cl−/Ca2+ | 6·67 | 23·17 | 1·99 | 11·51 |
| Xylem stem | ||||
| Na+/Ca2+ | 0·65 | 11·94 | 0·65 | 8·27 |
| K+/Ca2+ | 23·35 | 41·68 | 30·92 | 43·60 |
| Cl−/Ca2+ | 17·12 | 40·30 | 13·67 | 26·63 |